MANUFACTURE METHOD OF HIGH PURITY STEEL

摘要

PURPOSE: A method for manufacturing a high purity steel is provided, which is characterized in that slag is dispersed into small slag drop in ladle so that the molten slag drop captures and thus raise inclusions in molten steel. CONSTITUTION: In a manufacture method of high purity steel using vacuum degassing facility, the method is characterized in that the pressure of a vacuum vessel(5) is raised at a ratio of 38 to 50 Torr/sec to capture and thus remove inclusions of molten steel by dispersing molten slag remained in the vacuum vessel(5) into molten steel of a ladle(7) in the form of fine molten slag drop(13).